Power boiler



R. J. ROcKEFl-:LLER

June 4, 1940.

POWER BOILER v Filed June 25, 1938 w @n F 3 Sheets-Sheet 1 @@@oooeaoooo aq ll NVENTOR:

WITNES iaber .I/ockfeller,

A TTORNEYS.

June 4, 1940.

POWER BOILER 3 Sheets-Sheet 2 Filed June 25, 1938 W l TN ESSES June 4, 1940- R. J. RocKEFx-:LLER 2,203,365

POWER B0 ILER l Filed June 25, 1938 S'Sheets-Sheet 5v ZT'JC W I TN ESS l N VEN TOR:

' A TYURNEYS,

Patented June 4, 1940 UNITED STATES aztatc ATENT GFFICE POWER BOILER i Robert J. Rockefeller, Stroudsburg, Pa., assignor to The International Boiler Works Co., East Stroudsburg, Pa., a corporation of Pennsylvania,

Application June 25, 1938, rSerial No. 215,787

o?, 2 Claims.

This invention relates to boilers useful to generate steam at high pressures for power purposes.

My invention has for its chief aim to attain in power boilers, without necessitating use of su- "P perheaters, increased efficiency as regards the output of dry steam per square foot oilieating surface, and per poundof fuel consumed with maintenance of the flue gas temperature at a minimum degree consistent with good draft confl ditions.

I'he foregoing advantages I realize in a boiler of simple, compact and rigid construction wherein the walls of the combustion chamber are water jacketed throughout and in direct l5 communication with each other throughout their heights and transverse widths, as Well as in cornmunication at their tops with a longitudinallyarranged water drum which in part forms the top or roof of said chamber; wherein the hollows of opposite walls are connected by longitudinally extending tubes inclined somewhat to the horizontal with establishment of a ring circuit for the water; and wherein crosswise baiiles in the combustion chamber determine a sinuous 2 5 up and down course of travel for the hot combustion gases along the length of the boiler so that they are caused to cross and recross the water tubes several times before escaping into 'the flue.

r3.0 Other objects and attendant advantages will appear from the following description of theattached drawings wherein Fig. I is a view showing, in top plan, a power boiler conveniently embodying the present improvements. l

35 Fig. II shows the boiler partly in side elevation and partly in longitudinal section.`

'Fig III shows the front end elevation of the boiler,

Figs. IV and V are transverse sectional views 40 taken as indicated respectively by the arrows IV-IV, V--V in Fig. II.

As herein illustrated, my improved boiler has a reboX I with water-jacketed end walls and longitudinal side walls 2, 3 and 4, 5 respec- 45 tively, and a centrally-arranged lengthwise extending water drum 6 which is abutted by the inwardly directed upper end portions lla, 5a of said side walls. lAt the corners of the boiler, the hollows of the end and side walls 2, 3 and Il, ii

50 communicate with each other throughout their heights and transverse widths as `best shown in Figs. II, IV and V; and the drum 6 is cut away at opposite ends, as instanced in I in Fig. II, so

as to communicate directly with the hollows of 55 the end walls. Communication between the drum by a multiplicity of longitudinallyextending water tubes 9, which, as shown in Fig. II` incline downwardly from the front toward the rear end of the boiler, with consequent establishment of the ring circuit for the water which is normally maintained at a level L in the drum 6. The directionof-circulation of the water is as indicated by the dotted arrows in Fig. II, that is to say, upward in the hollow of the front wall 2, horizontally rearward in thev drum Ii, downward in the hollow of the rear wall 3, and forwardly in the tubes`9. A transverse partition It whereof lthe lower portion is constructed of masonry and the upper portion by a superimposed balile II which latter is penetrated by the tubes, 9, serves to set apart a combustion chamber I2 at the frontend of the boiler, said baiile terminating short of the top of said chamber. In the front end wall 2, below the level of the tubes 9, is a fire door opening I3, and in the rear end wall 3, above the level oi the tubes 9, an opening I4 which leads to a flue or chimney I5. Extending downwardly from the top of the rear subdivision of the fireboX I is a transverse 'baffle I6 which terminates short of the bottom of said firebox. Due to the described arrangement vof the baffles II and It, a sinuous up and down course is prescribed for the hot combustion gases in a direction longitudinally of the boiler, so that said gases are obliged to cross and recross the tubes 9 several times before escaping into the flue I5 for assurance of a maximum thermal interchange between them and the water in said tubes. Feed water is introduced into the boiler through a longitudinal pipe I'i which enters the drum Ii at the front end, see Fig. II; and steam is taken from the top'of said drum through a centrally connecting pipe shown at I8. In the top of the drum 6 are tapped holes I9 and 20, ZI respectively for a water column, and for safety valves (not illustrated). There is also a tapped hole shown at 22 so that a steam injector may be installed if desired. Openings with removable panels 24, 25

.in the side walls 3 and 4 of the boiler permit access for cleaning ofthe outsides of the tubes Il, which latter tubes are also accessible for internal cleaning or for replacement when necessary, upon removal of the plugs at 26, 2l from aligned tapped openings in the end walls 2 and 3.

The front and rear end walls 2 and 3 of the boiler are formed by spaced outer and inner head sheets 28, 29 and 38, 3l. The outer head sheets 28 and 3l] have inwardly-extending flanges 280., Stia respectively at their side edges, and semi-circular flanges 23h, 30h centrally of their top edges, said semi-circular flanges constituting the bottom halves of the end portions of the drum 6 at the regions of the cut-outs 5. As shown in Fig. II, the flanges 28D, 3th marginally overlap the cylindrical shell 32 of the drum at the edges of the cut-outs T and are secured by rivets 33, 35i. The inset heads 35, 36 of .the

drum 5 is in turn secured to said flanges and also to the ends of said shell by annularly-arranged rivets 31, 38 respectively. The inner head sheets 29, 3l of the end walls 2, 3 are depressed centrally of their top edges to forin cradles for the drum 5, and have inwardly-directed flanges 29a, Sla which are continuous with their side and top edges. Edge margins of the head sheets 28, 30 of the wall 2 at the re door opening i3 are flanged inwardly into abutting relation and welded together fluid-tight along the region of abutment as conventionally indicated at 3S in Fig. II. At their bottoms, the end wails 2 and 3 are closed by filler bars lill, il respectively (Fig. II) to which they may be either riveted or welded as found most convenient or expedient in practice.

The side walls 4 and 5 are similarly formed by suitably shaped spaced sheets 61'2, d3 and M, i5, and the side edges of the outer sheets 42, 1M being overlapped upon the inwardly-directed flanges 28a, Sila of the outer head sheets 28, 3G of the end walls 2, 3 as best shown in Fig. I. The si-de edges of the inner sheets 43, 55 of the side walls Il and 5 likewise overlapv the inwardly-directed flanges 29a, Sla of the inner head sheets 29, 3l of the end walls 2, 3; and moreover have marginal retroversions Mi, IH at their tops at the regions of abutment of said side Walls with the drum 6. As shown in Fig. IV, the outwardlydirected terminal flanges of the retroversions 46, 41 are overlapped by the top edges of the outer side wall sheets 2, da, and the side walls (l, 5 are closed at the bottom by filler bars 48, 49 in a manner identical with that described of the end walls 2, 3. At overlap regions and junctures between the several wall sheets and the drum 6 where riveting is impractical, welding may be resorted to for the formation of fluid-tight joints. Strength and rigidity of the hollow walls is had through employment of suitably allocated stay bolts'li more or less after common practice in the art. The flue opening lll is the rear end wall 3 and the panel-closed openings in the side walls 4, 5 respectively are preferably formed and nished like the fire door opening I3 in the front end wall 2 as shown.

In addition to the various appliances already mentioned, the vboiler is provided, within the combustion chamber I2, with a fusible plug 5l, see Fig. II, for safety purposes.

From the foregoing it will be evident that my invention affords a compact power boiler or high pressure steam generator whereof the component parts are few in number and interiltted and yassembled in such a manner as to form a strong rigid unitary structure which is entirely selfcontained', and in which the vpractical advantages herein-before pointed out are fully realized.

Having thus described my invention, I claim:

1. A sheet metal power -boiler comprising a combustion chamber with jacketed end and side walls which are in full communication throughout their heights and transverse widths, anda horizontal cylindric steam drum which rests in central conformative recesses in the tops of the end walls and which has openings for communication respectively into the hollows of the end walls, equal in areas to the extents of mutual abutment, said end walls being formed by spaced pairs of head sheets whereof the inner ones have inwardly-directed flanges along their vertical edges and continuing inwardly-directed flanges across their top-s for conformative abutment with the bottom of the steam drum, and whereof the outer ones have inwardly directed flanges along their vertical flanges at their tops for conformative abutment with the bottom of the steam drum, and said side walls being formed by spaced inner and outer sheets whereof the inner ones have outwardlyturned box ilanges along their tops for abutment against opposite sides of the steam drum and for overlap by the top edges of the outer side wallv sheets, said inner and outer side wall sheets having their vertical end edges respectively overlapping the corresponding inwardly directed vertical edge flanges on the inner and outer head sheets of the end walls.

2. A sheet metal power boiler according to edges and outwardly-directedv claim 1, having horizontal tubes within the combustion chamber connecting the hollows of the end walls; .and means within the combustion chamber defining a sinuous up and down course for the combustion gases longitudinally of the tubes.

ROBERT J. ROCKEFELLER. 

